Rock bolt

Abstract

A rock bolt includes an elongate tubular body with an internal bore. A filler material is insertable into the internal bore at one end of the elongated tubular body. The end of the tubular body is then deformed thereby using the filler material to seal the end of the bore. The filler material may be a non-metallic material, such as a tube of plastic.

What is claimed is: 
     
       1. A rock bolt comprising:
 an elongate tubular body having an internal bore, a leading end and a trailing end; and 
 filler material in the internal bore at the leading end of the elongate tubular body, wherein the filler material is initially a tube of a plastics material which can fit closely into the internal bore at the leading end of the elongate tubular body and further wherein, when the leading end of the elongate tubular body is deformed, the filler material seals the internal bore of the elongate tubular body at the leading end thereof. 
 
     
     
       2. A rock bolt comprising:
 an elongate tubular body having an internal bore, a leading end and a trailing end; and 
 filler material in the internal bore at the leading end of the elongate tubular body, wherein the leading end of the elongate tubular body is deformed so that at the leading end a first half section of the leading end of the elongate tubular body is forced into a diametrically opposed second half section of the elongate tubular body, and the filler material fills a space between opposing surfaces of the first and second half sections and seals the internal bore of the elongate tubular body at the leading end thereof.